Aside from dark thoughts, the “How Do I Live” crooner also confessed to worrying about her husband, actor Eddie Cibrian, cheating on her with another woman.

In 2009, Rimes and Cibrian, 39, made headlines with their controversial relationship when they both left their respective spouses — actor Dean Sheremet and Real Housewives of Beverly Hills star Brandi Glanville — for each other.

When asked if she ever thinks about her husband cheating on her like he did to Glanville, Rimes replied that the thought has crossed her mind more than once.

“I would be ignorant to say, and everyone else would think I am a liar if I didn’t say yes, and I have at times,” she revealed, adding that Cibrian had the same concerns about her.

“Speaking for him, I would actually say that’s creeped into his [mind]…I think we’ve been very honest and open with that to each other and our conversations about it have only made me understand how much he actually cares, as much as I do, about being faithful to each other.”

Rimes also said that when writing for her latest album, Spitfire, many of the songs regarding infidelity spoke to her and her ex.

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“He actually heard the song when I wrote it and, actually, he knew what it was about before I did,” she revealed. “He knew I was feeling feelings. I’m not sure what those were that he knew.”

“It’s a very complicated situation,” she added.

In October, Rimes gave an update on her life to 20/20‘s Katie Couric, admitting, “I feel like I am starting over even though I’ve had all these years behind me. How many people get to [start] over again in this day and age?”

Rimes’ interview with ET will air on Jan. 16. See a sneak peek of it in the video — above.

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